iii
TABLE OF CONTENTS
FOREWORD....................................................................................................... viii
SYSTEM CONFIGURATION ................................................................................. x
1.
OPERATIONAL OVERVIEW .........................................................................1-1
1.1
Control Description ............................................................................................................1-1
1.2
Turning the Power On/Off .................................................................................................. 1-2
1.2.1
Turning the power on ............................................................................................ 1-2
1.2.2
Turning the power off ............................................................................................ 1-2
1.3
Lowering, Raising the Transducer ..................................................................................... 1-3
1.3.1
Lowering the transducer........................................................................................ 1-3
1.3.2
Raising the transducer .......................................................................................... 1-3
1.4
Screen Brilliance ................................................................................................................ 1-3
1.5
Control Panel Dimmer........................................................................................................ 1-4
1.6
Display Mode, Display Division.......................................................................................... 1-6
1.6.1
Selecting a display mode ...................................................................................... 1-6
1.6.2
Sample display mode pictures .............................................................................. 1-7
1.7
Adjusting the Gain............................................................................................................ 1-11
1.8
Menu Overview ................................................................................................................ 1-12
2.
HORIZONTAL MODE ....................................................................................2-1
2.1
Basic Operating Procedure................................................................................................ 2-1
2.2
Horizontal Mode Indications and Marks............................................................................. 2-2
2.3
Display Range.................................................................................................................... 2-3
2.4
Tilt Angle............................................................................................................................. 2-3
2.4.1
Setting the tilt angle............................................................................................... 2-3
2.4.2
Automatic tilt.......................................................................................................... 2-4
2.4.3
Bottom echo and tilt angle..................................................................................... 2-5
2.4.4
How to discriminate fish echoes from the bottom................................................. 2-5
2.4.5
Tilt angle for surface fish ....................................................................................... 2-6
2.4.6
Suitable tilt angle ................................................................................................... 2-7
2.5
Finding Range and Bearing to a Target ............................................................................. 2-8
2.6
Eliminating Weak Echoes .................................................................................................. 2-8
2.7
Suppressing Bottom Tail .................................................................................................. 2-11
2.7.1
AGC..................................................................................................................... 2-11
2.7.2
By decreasing pulselength .................................................................................. 2-12
2.7.3
2
nd
AGC ............................................................................................................... 2-12
2.8
Suppressing Bottom and Sea Surface Reflections in Shallow........................................ 2-13
2.9
Rejecting Sonar Interference and Noise.......................................................................... 2-14
2.9.1
Identifying noise source ...................................................................................... 2-14
2.9.2
Interference rejector ............................................................................................ 2-14
2.9.3
Changing Tx interval ........................................................................................... 2-15
2.9.4
Shifting Tx frequency........................................................................................... 2-15
2.9.5
Noise limiter......................................................................................................... 2-16
2.10
Adjusting Beamwidth ....................................................................................................... 2-16
Summary of Contents for FSV-24
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